jan arnett (2) Posted March 29, 2021 Share Posted March 29, 2021 What is the required gap between a cast iron piston and the cylinder wall. The rings are also cast iron for a low RPM engine, The engine is for a 1923 Moon. Link to comment Share on other sites More sharing options...
edinmass Posted March 29, 2021 Share Posted March 29, 2021 Bore and stroke please. Link to comment Share on other sites More sharing options...
jan arnett (2) Posted March 30, 2021 Author Share Posted March 30, 2021 On 3/28/2021 at 8:40 PM, edinmass said: Bore and stroke please. Bore 3", stroke 4.5. Link to comment Share on other sites More sharing options...
Oldtech Posted March 31, 2021 Share Posted March 31, 2021 Dykes says .001 for each inch diameter so .003 ( 3 thousandths). Cast iron pistons can be fairly tight as they don't expand a lot, so .003 would be plenty IMHO. Link to comment Share on other sites More sharing options...
edinmass Posted March 31, 2021 Share Posted March 31, 2021 (edited) 4 minutes ago, Oldtech said: Dykes says .001 for each inch diameter so .003 ( 3 thousandths). Cast iron pistons can be fairly tight as they don't expand a lot, so .003 would be plenty IMHO. I agree........3-4 for cast iron pistons. Modern pistons with modern ring packages and materials may call for something different. Edited March 31, 2021 by edinmass (see edit history) 1 Link to comment Share on other sites More sharing options...
nickelroadster Posted March 31, 2021 Share Posted March 31, 2021 Are you trying to reuse the old pistons? Modern aluminum pistons would probably have just a little more clearance and would probably work a litle better. 1 Link to comment Share on other sites More sharing options...
jan arnett (2) Posted April 2, 2021 Author Share Posted April 2, 2021 I am replacing one piston which had a failed skirt with another original piston. Thanks for the help. Jan 1 Link to comment Share on other sites More sharing options...
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